SelectCell in powerbuilder 10 and QTP 10

[guttustand]

It has the product number similar to the row 2 , 3 . It selects the first row, but it in turn throws the error and when I do a skip on the error message box , it moves to the next vbscript statement ( though it selected row 1) , where as it doesnt throws error when i select the row 2 or 3 .
Why does it happens particluarly on selecting first row